I used it just last week. Thanks to a bad choice regarding kernel modules on Canonical's part I had an update to Ubuntu 22.04 on a Raspberry Pi leave the RPi in

I used it just last week. Thanks to a bad choice regarding kernel modules on Canonical's part I had an update to Ubuntu 22.04 on a Raspberry Pi leave the RPi inaccessible via Ethernet. Luckily I have the serial console on the RPi connected to another co-located device for exactly this potential situation. I was able to ssh to the other device, launch a serial terminal from there to the RPi and transfer the deb file needed to fix the problem directly to the RPi from my laptop via modem.